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Old 08-13-2020, 04:15 PM   #1
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Check Trans Light

Hey everyone new to the site but have a total of 4 skoolies .
I have a 2003 IC bus with a DT466E and a 2000 series transmission.
i have this bus gutted and all open so i used it for a media room a couple weeks ago on a family camp out i took two buses there and the IC was where the kids were hanging out. So over the weekend there were 12 kids in and out of the bus (some mine and some not mine) anyhow some were playing in the driver seat and pulling on the gear shiftier, when i drove the bus there it was fine now the Check Trans light is on and it is stuck in low gear 18 mph might i add. Wondering if there is some easy fix or will i have to have a mobile company come and hook up to the bus for a diagnostic.

Thanks in advance
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Old 08-14-2020, 04:43 AM   #2
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Sounds like your transmission is in "limp-along-mode". I have no idea how it got there nor how to "fix" it, other than disconnecting the battery for a day to let the computers (engine and transmission) reset.
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Old 08-18-2020, 02:18 PM   #3
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so i unhooked the batterys on it for a few days now went back today and hooked everything up got in the seat to start it it started just fine but i still have the Check Trans light on the dash. i have looked at the transmission shiftier arm and it moves like it should and transmission fluid is up to where it should be as well
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Old 08-27-2020, 06:42 PM   #4
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HELP!!!!
So i took my TCM off and had it tested the guys there were super helpful and said everything in the TCM seamed to be fine and advised me to check the OHMs resistance on the C and D pin in the Data link hook up it should be 60 OHMs im reading 78/88 OHMs.
Has anyone ever had this problem?
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Old 08-27-2020, 07:00 PM   #5
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are the codes getting set indicating a J1939 communications fault? the ohm reading you are getting shouldnt take the link down.. if it was open on one or the other wires or shorted to ground then you'd have issues for sure..



a broken data link wont Limp the transmission it will run it in Non-lockup mode but you will have all the gears.. if it is Limped (usually 2nd or 3rd gear depending on the inhibit schedule in the TCM) if it is truly stick in first then id suspect a solenoid that has stuck on and wont release id have to look and see which shift solenoid operate in which gear.. its hard to tell without reading the fault codes
-Christopher
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Old 08-27-2020, 07:27 PM   #6
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Yes the print out he gave me today says
SAE J1939-11 along with U0100 and Previously U2105

I had to drive it from where it went into limp mode and its Definitely stuck in low gear 18 mph is top speed i had to drive it 3 miles to my house.

The guys there told me to test the OHMs and if it wasnt 60 then to check the Termination Resisters.

After looking around and tracing some wires down i found a yellow wire that is pulled out of its connector and a green wire that is exposed however i tried to fix it the paperwork shows a triangle three prong connector and my bus has a circle 4 prong compatible 3 prong connector that is at the Transmission, Engine, Data link (in rear at operators panel) and at the driver seat Data link

How would you fix this issue properly
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Old 08-27-2020, 07:35 PM   #7
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you sre right the yellow and green wires are the DataLink.. you kind of confused me with the run on of locations. are the wires pulled out near the engine? near the trans? ive usually seen a 3 pin connector with yellow / green / black.. if one wire is opulled out and the pin is missing you should be able to look down the connector and see the pin .. or a scuffed hole if the pin popped out with the wire
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Old 08-27-2020, 07:45 PM   #8
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Yes the Yellow wire that is pulled out of its connector is right next/above the TCM all other Yellow Green and Black connectors seem to be in good working order.

Would this problem put the system into limp mode.
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Old 08-28-2020, 05:39 AM   #9
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I’ve not seen a down 1939 link limp a trans unless it’s a 2008 or newer that has SEM enabled, doesn’t mean allison didn’t have others that limped one days I’ve just not seen them, that said you need to fix it anyway as even if you got all 5 gears back you’d ruin it from heat with the link down.

Your profile isn’t filled out so I have no idea what bus you have to begin to look for the wiring pin outs , again usually you can tell where something got pulled out from or see another connector half where you look for the wire on the other side.

The universal colors for j1939 are yellow green for can high and low and then black for reference ground. But leave it to navistar to use grey in places esp near the dash connector.

Somewhere I read kids were playing in the bus? Is it possible they trashed the shift linkage cable so it’s actually in “1” and not D? When you test drive it? That won’t fix the data but just curious..
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Old 08-28-2020, 10:24 AM   #10
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Yes there were a lot of kids in and out of the bus that weekend and some of the littles were pulling on the shiftier, I thought the same that they may have trashed the cable so i checked at the transmission and watched the actuator arm move into every position as well as indication inside the driver seat.

I am convinced it something dumb i drove it there and it was fine then on the next start up bam!!! limp mode!!!

So a little history about it i bought it and did a complete in frame motor rebuild myself and have drove it almost 2k now on the motor everything has been a dream on it it worked and shifted great never had any codes or faults even on start up after siting for 2 years. I just dont get it now with looking at wires and connectors i found this yellow wire pulled out of its connector and the code is J1939 error

Im not sure how to properly fix this connection as i cant get the pin out of the plug i feel as if i am going to trash the whole connector if i keep messing with it not sure if you can buy the connector already together and cut to solder or what
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Old 08-28-2020, 07:21 PM   #11
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you can buy a pin tool, i have various ones I use for extracting pins.. depending on the connector, new pins with pigtail can be bought and then pushed into the connector.. which connector is the wire pulled out of? the large many-pin connector on the trans TCM? the 3 or 4 pin connector in the harness? if I saw pictures of the broken connector I might be able to better guide you to what type of connector it is..
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Old 08-29-2020, 11:57 AM   #12
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These are this sister plugs to the one that has the Yellow wire pulled out of the back of the group of wires that is at the Transmission. im pretty sure these are the data link cables but not totally sure. This group of wires are at the Engine ECM, Transmission TCM, and the Data link 9 pin connectors at the front and back of the bus
IMG-3543.jpg

IMG-3544.jpg
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Old 08-29-2020, 02:47 PM   #13
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Yep those are indeed newer style data link connectors.. fix the yellow wire and likely issues will go away. That connector may be a dealer only item, hopefully there is a repair part, of not that is a data bus. You could splice into the good part of the yellow wire and then jump it to the yellow wire (immedatly) opposite of it and go.

You could also cut the bad connector off on both ends and replace it with a weather pal or metripak style connector that is weatherproof .. the main thing is that the wires are connected to each”s mate
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Old 08-29-2020, 07:34 PM   #14
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I will try and contact a dealer on this part and see if its available from them. If not then i will look at trying to repair the wire and see if it fixes the issue i will keep you informed will try and look at splicing tomorrow just to get an idea of what it may entail

Cadillackid i cant begin to thank you for your input on this i will take some pictures and keep the page updated.
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Old 08-29-2020, 08:42 PM   #15
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try this as a start..


https://www.peigenesis.com/en/shop/p...094.html#mates


thats the splice..



and the mate appears to be a 086-0068-000



I could see a 08 barely on your pic and the splice number. . so I think I got that right.. it looks like there is also a crimp tool in that site too.. now i have no idea how to order them.. however with an ITTCannon part number you may be able to go to work on it..


-Christopher
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Old 08-29-2020, 08:45 PM   #16
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maybe this?


https://www.ebay.com/i/254629764295?...saAq7wEALw_wcB
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Old 09-01-2020, 07:51 PM   #17
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With work and all the rain we have been getting here in Southeast Tennessee i have not had a chance to work on the ole girl. I have looked at the connectors and have had some long in depth talks with a few of my buddy mechanics who have basically told me what i already know that the right fix will be the connectors and the cheap fix will be the splice option. They also said splice it to see if that fixes it and if it does fix it properly from there. So i will be doing a splice on it hopefully soon if the rain holds out maybe tomorrow fingers crossed!!!
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